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To create a so-called internal link to a page on the same wiki (a "wikilink"), use double square brackets wiki markup, [[like this]]. When you preview or save your changes, you will see a link that can be followed to the target page. If the page exists the link is displayed in blue (like the word "create" in the first sentence of this paragraph); if the page does not exist, the link appears red (so the [[like this]] link is actually rendered like this). Note that the colors could be different if the color scheme of the wiki has been changed from the default. Following such a "redlink" to a missing page (whether or not it is actually red) will usually enable the user to create the page.

To markup any arbitrary string of text (not necessarily a page title) as a link, use a "vertical bar" or "pipe" character, like this: [[Help:Categories|category links]] results in the link category links.

The first letter of the link target is usually not case-sensitive (unless the wiki is configured otherwise), meaning links can be capitalized or not (so How to contribute and how to contribute are equivalent). However, the case of every subsequent letter must match the target page exactly (so How to contribute and How To Contribute are not equivalent). Spaces in the page title may be represented as underscores (so How to contribute and How_to_contribute are again equivalent), but using underscores in links will make them visible in the page text (but this can be prevented by using a "pipe").

If the page title you are linking to is that of the page you are editing, the result is not a hyperlink at all but simply bold text (for example, on this page the markup [[Help:Links/vi]] gives the result Help:Links/vi). If you're trying to create a wikilink to the current page, you probably want to link to a specific section or to an anchor within the page; see the examples below.

Rendered block-level and inline, respectively.
Doing this would allow for [[#Unique anchor name 1]] on the same page or [[Help:Links/vi#Unique anchor name 1]] on a different page.
Omit the "optional text" for an invisible anchor.

Setting an anchor in a section heading

==<span id="Alternate Section Title"></span>Section heading==

Note the placement.
This must be a "span" tag, not a "div".
(Such anchors allow sections to be retitled without breaking incoming links.)

Revision numbers can be found in each page's edit history.
(It is very common to see links to specific revisions implemented as external links because it's easy to cut-and-paste an entire URL to form an external link.)

External links

To create an external link, usually to a page at a different website, enclose the URL followed by space and the link text in single square brackets (see examples below). When you save or preview the page, you will see a link rendered slightly differently than an internal wikilink. It may be a different color and/or be followed by an arrow icon to show that it may lead to another site.

The link will be HTTP or HTTPS depending on the protocol of the page currently being viewed (which could be different for different users).
This is only supported inside of square brackets [ ].
Using "//en.wikipedia.org" by itself does not result in a link.

Interwiki links

Interwiki links are internal-style links to other websites (which do not have to be wikis, despite the name). For example, you can link to the article http://en.wikipedia.org/wiki/Sunflower by typing [[wikipedia:Sunflower]] or, on this wiki, the shorter [[w:Sunflower]]. Both will result in a link wikipedia:Sunflower. This works because by default MediaWiki configures wikipedia: as an "interwiki prefix" that turns into http://en.wikipedia.org/wiki/ when used inside [[ ]]. (It may not work if the admin of your wiki has changed the setting.) Unlike internal links, interwiki links do not use page existence detection, so an interwiki link will appear blue even if the page does not exist on the remote wiki.

Similar to internal page links, you can create piped links, with alternate link label, e.g. [[wikipedia:Sunflower|big yellow flower]] is the link big yellow flower and [[wikipedia:Sunflower|]] is the link Sunflower.

Basically, interwiki links are abbreviations for commonly-used longer external links. A very similar link could be created as [http://en.wikipedia.org/wiki/Sunflower big yellow flower].

Interlanguage links

If your wiki has other language versions, you may find “interlanguage links” in the sidebar, just below toolbox in a section titled “ngôn ngữ khác.”

In wiki markup an interlanguage link looks very much like an interwiki link, but behaves similarly to a category link in that it is rendered in a special way. While category links appear in a special list at the bottom of the page (usually), interlanguage links appear in a special list in the sidebar of the page (or elsewhere, depending on the wiki's configuration and the skin used).

The purpose of interlanguage links is to link pages on the same topics in different languages. To create an interlanguage link, type [[language prefix:page name]] anywhere in the page (preferably at the bottom, like category links); the language prefix is the prefix specified at your wiki for the other language version (typically the ISO 639-1 language code).
The interlanguage link is unilateral, it does not point back from that page in the other language.
For that purpose, an equivalent back-link needs to be placed there as well.
It does not work like the "Edit links" in the languages section of Wikipedia-language versions.
But it can be used across all name spaces, including 'User:' to point to ones other profiles in other languages.

If you want to make the interlanguage link appear at a specific place in the content of the page rather than in the sidebar, add a colon before the language prefix: